1MHz Multi-Resonant Push-Pull 48V VRM

For future high-end server and workstation applications, it will be impractical for voltage regulator modules (VRMs) to draw power from the 12V output of the silver box because the voltage bus will be too low to deliver the increasing high levels of power. Therefore, distributed power systems (DPSs) with buses of 48 V will be more feasible solutions for future high-end computers. This paper presents a novel multi-resonant push-pull (MRPP) topology for 48V VRMs, based on methods for reducing the conduction loss and eliminating the body diode conduction and reverse-recovery losses of the synchronous rectifier. Two 48V-1.2V 70A prototypes are built, and their efficiency is 86% at 1 MHz.

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